/*
 * File: CFdEventKQueue.h
 * Copyright (c) 2010. Silviu Caragea <silviu@intelliproject.net>
 * Created on Octomber 12, 2010, 12:34 AM
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  1.Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  2.Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  3.All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *       This product includes software developed by the University of
 *       California, Berkeley and its contributors.
 *  4.Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef CFDEVENTKQUEUE_H
#define	CFDEVENTKQUEUE_H

#include "../IFdEventInterface.h"

#ifdef USE_KQUEUE

#include "../../utils/CException.h"
#include <sys/event.h>

/*
	http://www.freebsd.org/cgi/man.cgi?query=kqueue&sektion=2	
*/

namespace litevent
{

const struct EventMothodSignature sigKqueue =
{
    "kqueue",
    EnumEventHandlerTypeKqueue
};


class CFdEventKQueue : public IFdEventInterface
{

public:

    explicit CFdEventKQueue(size_t maxfds);
    ~CFdEventKQueue();

    int reset();

protected:
	
    int poll(int timeoutMs);
    int getEventRevent(size_t node);
    int getEventFileDescriptor(size_t node);   
    int setEvent(int fd_node , int fd, int events);
    int deleteEvent(int fd_node, int fd );
    int getEventNextFileDescriptor(int node);
	
private:
    int kQueueFd;
    struct kevent *kQueueResults;

    DISALLOW_IMPLICIT_CONSTRUCTORS(CFdEventKQueue);
};


inline CFdEventKQueue::CFdEventKQueue(size_t maxfds):IFdEventInterface(maxfds)
{
    this->kQueueFd = -1;
    this->kQueueResults = (struct kevent*)calloc(this->maxfds, sizeof(*this->kQueueResults));

    /* initialize kqueue. also we can call reset*/

    if (-1 == (this->kQueueFd = kqueue()))
    {
        util::CLogger::sharedLogger()->WriteFormated("%s.%d: CFdEventKQueue failed: %s. use other engine instead", __FILE__, __LINE__,strerror(errno));
        throw util::CException("CFdEventKQueue failed. Use other engine instead");
    }
  

};

inline CFdEventKQueue::~CFdEventKQueue()
{
    if(this->kQueueFd != -1)
	close(this->kQueueFd);

    if(this->kQueueResults)
       free(this->kQueueResults);
}

}

#endif

#endif	/* CFDEVENTKQUEUE_H */

